I have a Fabia as a runabout. The electric windows stopped working  when down. I took the door card off and removed window motor (Torx 30 , 3 screws)  so I can pull the window up  I checked all the wiring fuses ect all ok. I checked voltage 12.7 at the battery but only  9.7v at the fuse .  Maybe a dodgy earth?  Hooked the battery charger up put it on fast charge for 30 mins .  Low and behold all working again. I know I should really look for the fault but this has worked 3 times now when windows have stuck down always after not using for a few days.  Well worth a try before a garage charges you  a small fortune .

If your battery is down to 9v after a couple days and struggling to hold charge, it sounds like your battery is probably on its way out.

I said the battery was 12.7v  but at the fuse  only read 9.7v. So nothing wrong with the battery.